摘要
The last Monday in February is the ＂Rare Disease Day＂ every year. This year the theme of it is ＂Join us in making the voice of rare diseases heard＂, proposed by World Health Organization （http：//www.rarediseaseday.org）. Rare diseases are a group of serious chronic diseases, with a high morbidity and mortality rates.
The last Monday in February is the ＂Rare Disease Day＂ every year. This year the theme of it is ＂Join us in making the voice of rare diseases heard＂, proposed by World Health Organization （http：//www.rarediseaseday.org）. Rare diseases are a group of serious chronic diseases, with a high morbidity and mortality rates.
